weiss



(No Model.) 2 Sheets-Sheet 1.

E. WEISS.

GRINDING MILL. No. 374,101. Patented Nov. 29, 1887.

v a o 6 wmo c to o v wn -1-- ill 1111 l a N. PETERS, Plmln-Lithngrapllar. Washinglnm 0 cv (No'ModeL) 2 Sheets-Sheet 2.

E. WEISS.

GRINDING MILL.

No. 374,101. Patented Nov. 29, I887.

N PETER. Plmlc-ulllagmpher, Wnshmglun, an.

' UNITED STATES PATENT OFFICE.

EMIL WEISS, OF BERLIN, GERMANY, ASSIGNOR-OF ONE-HALF TO LOUIS FRAENKEL, OF SAME PLACE.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 374,101, dated November 29, 1887,

Application filed February 16, 1887. Serial No. 227,841.

(No model.) Patented in Germany April 30, 1886, No. 37,831, and in France July 7, 1886, No. 177,204.

To all whom it may concern.-

Be it known that I, EMIL WEISS, a subject of the Emperor of Austria-Hungary, and resident of Berlin, Prussia, Empire of Germany, have invented some new and useful Improvements in Grinding-Mills, (for which I have obtained Letters Patent in Germany, No. 37,831, dated April 30, 1886, and in France, No. 177,204, dated July 7, 1886,) of which the following is a specification. v

The purpose of the machine described hereinafter is to separate the coarse ground material produced by the process of crushing grain between crushing-rolls.

The invention consists in the construction and combination of parts, hereinafter de scribed and claimed.

Figure 1 of the accompanying drawings shows the machine partly in side View, and partly in vertical section on the line a: y of Fig. 2. Figs. 2, 3, and 4 show horizontal sections on the lines M N O P R S in Fig. 1, and Fig. 5 shows a part of the outer casing.

The construction of the machine is as follows: The casing b, which is composed of two parts, is fixed to the base a. The inside of casing 11 is lined with steel-wire gauze and is provided with several rings, 0, arranged one above the other. The rings a are provided with slits c. The vertical shaft 10, which may be driven by the pulley w, runs in the center of the stationary cylinder. The cylinder d, the peripheries of which are likewise covered with steel-wire gauze, are secured firmly to the shaft to. The upper side, 6, of each of these cylinders d is slanted off on the outside. Several fans, f, are fastened to the under side of each cylinder, and reach close over the upper surface of the next cylinder below.

0 is the feed-opening for the grain that is to be operated on.

The operation of the machine is as follows: The crushed or coarse ground grain or chop falls through the opening 0 into the machine, and is thrown outward by the turning of the first cylinder d. It falls between the outer cylinder 1) and the periphery of the uppermost cylinder,-and is ground fine there. From this interspace the grain falls on the separation-ring c, from which it is carried by the rotating fan f, that sweeps over and cleans the said ring. Fan f sweeps the material to the opening 0 in the ring a, through which it falls on the top of the next cylinder. When the chop reaches this cylinder, the centrifugal force drives it to the periphery, and is assisted therein by the slanting upper surface, e,of the second cylinder. The chop is treated between the casing of the second, third, and following cylinders and the outer cylinder in the same way as above described.

In addition to the centrifugal force, the fans f assist in moving the material from compartment to. compartment by sucking air through the feed-funnel 0. By this means the chop, which would otherwise become heated by the continuous grinding, is constantly kept cool. When the chop has passed the five cylinders, its reduction is complete, and it then escapes through the spout k and can be sifted by another machine.

A very important improvement in this machine, as regards the treatment of the different parts, is the employment of the adjustable outer wire'gauzecylinder, such as is represented in Figs. 2 and 3. The diameter of the outer cylinder can be reduced by bringing the two halfcylinders together. The cylinder can therefore be made adjustable in the simplest way by laying thicker or thinner intermediate strips or pieces, i, between the two halfcylinders, which are held together by screws.

This suffices to allow the machine to grind different kinds of grain, coarse or fine, as may be required.

Having fully described my invention, what I claim, and desire to'secure by Letters Patent of the United States, is-

The rotating cylinders d, placed one above the other and covered with wire-gauze, in combination with fans f, fixed to theunder surfaces of the cylinders, and a stationary outer cylinder, 1), lined with wire-gauze and provided with separation-rings c, for the purpose as described.

In witness whereof I have hereunto set my hand in presence of two witnesses.

EMIL WEISS.

Witnesses:

O. MT'IHLMEN, B. R01. 

